Renewable fuse



f F. N. coNANT.

RENEWABLE FUSE. APPLICATION FILED IuLY Io, I9I9.

j y, NIT ED AIENT ormcey FRANKLIN N. `ooNAiWr, oF/NEWBURYPORT, MASSACHUSETTS, ASSIGNOR, BYMEsN-E lASSIGrNIVIENTS, To THnucIIAsE-SHAWMUT coI/IrANY,A CORPORATION oir-'MASSA- CHUSETTS.

IIENEWABLE FUSE. s

To all whom t may concern.'

Be it knoivn that I, FRANKLIN N. CoNaNT, a citizen of the United lStates, a resident of Newburyport, in the county of Essex` and State of Massachusetts, 'have -invented an Improvement in ReneWablevFuses, ot which the following is a specification. n This invention relates to electric tusesfot the cartridge-type and is in general based on the inventions described -in the Gibbs Patent No. 797,054, dated August 15, 1905,`

and my PatentNo. 1,299,132, datedfApril 1,1919., y f

, Such fuses have a. non-conducting, tubular casing and a` fusiblevelement longitudinallyarranged Within, .having terminals ot -thejknife blade type. y More particularly my'fusehas atubular .casing Supplied With metal terrules Awith in- `turned flanges or lips. These flanges have openings to receive the knife blade terminals and l.projections to engage notches in the knife blade terminalsavhen the same have been partially rotatedv axially so Yas to `lock -theterminalsfin liXed position longitudinally, a plate having a central opening with projections therefrom adaptedfto hold'the knife blade and-fmeans for holding,s'aid..

plate in fixed position With relation tothe ferrule langes and removable endv caps.

tudinal section of an electric fuse embody- `.ingthis invention.y l y 1 y Fig. 2 is a Sectional" detail of; any end; poration oi a fuse on the line -m, Fig. 1. 1

Fig. is yan end vievvot the fuse. Fig. 4 isa ,similarvieim the end cap, the

packing Washer andiuetal Washer being lre-` ,moved'. Y Fig. 5- is a similarl vie\v,-with the removallele elements removed. i

`Figli is a planview, and, f

Fig. .7 isa `vertical section of the holding platcrfor thev fusible element. Figs. 8 and9 are views of packing Washers respectively.

v10 represents the tubular lnoncond-ucting fuse casing of any suitable dimensions, .and 12 a errule securely. fixed the end there of 'by 'pins 13, inthe usual manneror by other suitable means.

Said errule is composed-cot metal and is externally screw-threaded, vandghas an inturned lip 14 at its outer end provided with y ASipecication of Letters latent.

Application filed July 10,

the.; metal and 1919. yseriarno. 309,813.

a pair otnotchesl arrangedat diametrically opposite points. Y

16frepresents the'terminal of the --usible Patented July 11,1922.

link, Which is madeas a bladek or fiat plate,

having notches 17, yk17,: in .its edges -Which receive the lip 14, when said blade is projected through the open end of the'iferru-le by Way of the notches 15 and turned aquar- `terof a revolution. i

Said terminal blade 16 hasvanextension 18, atv its inner end over whichV eXtendstt-he end portion of the fusible strip 19, which is or maybe detachably secured theretoby a v. bolt 20, or other means.

A plate is arrangedtobe threaded on the blade 16 and pressed into position on the end the opening at the end thereof. f

A,ot-rtheerrule. Whenpsoplacedfit extends over, and substantially closes As hereshown, 1t` consists of a circular .plate 25 composed of metaland madev of a diameter substantially?equalto the diameter @ot the.y terrine, against the open end of which -f it isfplaced. Y y l The plate l25V hasfoppositely :disposed-years 26, struck up from it, or `otherwise provided, :which ext-end downwardly, `and wvhen the plate ,is placed in Vposition on the endv of: the terrule `said ears will `enter-the notches 15 in the lipI 14 `and thereby be held-against .F-ig. 1 isaside elevation and partial longi.-`

" substantially. f corresponding in shaper and size with a` transverse, section ot' theterminal Y blade, toreceive said,bladeand saidY aperture is extended diametrically across the 1 centerot the .pla-te so that theblade `will be centrally localized with relation 'f to vthe fer-rule. l f

y The plate is thi-n, being made offsheet metal, zand to increase its contact area with `the blade lips 28, 2S, are provided at'oppof site si des of theriaperture 27,' urhichz extend downward `and ihave. :a normalv tendency to incline toward each other slightly-.Solthat f when the yblade .is projected through the aperture said lips. Will beengaged by; it.v and Will be slightly sprung Lapart. f

These lips may or may not extendifthe. full '.lengthiofthe sides of.rtheaapert-ure 27, as

desired, being hereashown as extended ,f only along thegmi'ddle .portions thereof.v

',Theaelongatedlaperture 271 istnarrow and one of the lips 28 may be Struck up from the plate, but so far as my invention is concerned, the formation of the lips as well as their dimensions may be varied,

IVith the parts so far described there will be a leakage of gas from the casing when the fusible elements blow, or explode, on a rupture of the fuse, hence means are provided for preventing an undue escape of the gaseous products of combustion, and. as here shown, a yielding washer 30 of leather, leather substitute or some such material, and of circular form is arranged on the plate 25 which has an eloi'igated aperture 3l tightly tting the terminal blade.

Then this 'washer isk pressed down hard by means to be hereinafter described, as upon assembling the component parts, the end portion of the `ferrule will become tightly closed.

A metal washer 33, of circular form and having an elongated aperture 34 fitting the terminal blade is designed to be placed next the packing washer 80.

It is made of substantially the same diameter as the packing washer so as to engage saidpacking washer over all.

35 represents an end cap which is internally screwethreaded for engagement with the externally screw-threaded ferrule, and has an aperture 36 at it-s outer end, through which the terminal blade projects.

Said aperture is of circular form and of considerable lesser' diameter than the vcap so that an-inwardly extended lip is provided around the margin of the cap, for engagement with the metal washer 33.

Upon screwing said end cap onto the ferrule the metal washer 33 and yielding `washer 30 and terminal holding plate 25 will be pressed hard together and against the end of the ferrule, thereby binding' the several components tightly together and holding the several components including the terminal blade in fixed relation to each other, and localizing said blade with relation to the other components.

So far I have described in detail the structure of one end portion of the fuse, and it will be understood that the other end portieri will be similarly constructed. i

In case the fuse blows the holding' means at both ends of the casing are removed to permit the removal of the terminal blade and in order that the new fusible link may be provided and the casing cleaned out.

This operation may be easily and quickly performed and a new fusible element sup plied, whereupon the several components will be reassembled.

I claim l. In an enclosed electric fuse of the cartridge type, the combination of a ferruled insulating Casin havinor an inturned lip at the end of t e ferruIe with oppositely disposed notches7 a fusible element having a terminal blade with notches in its edges for engaging said lip' by way of the notches therein, a holding plate for the terminal blade substantially closing the open end of the casing having an elongated aperture tor the terminal blade and lips engaging said terminal blade and means including an end cap for holding' the parts assembled.

2. In an enclosed electric fuse ol' the cartridge type, the combination of a 'lerruled insulating casing, having an inturned lip at the end of the ferrule with oppositely dis posed notches7 a fusible element having a terminal blade with notches in its edges for engaging said lip by way ol the notches, a holding plate for the terminal blade which substantially closes the open end of the rasing having ears which enter the notches` in the lip and having an elongated aperture for the blade and lips engaging the blade and means including an end cap 'for holding' the parts assembled.

3.V In an enclosed electric fuse of the cartridge type, the combination of a ferruled insulating fuse casing having an inturned lip at the end of the ferrule with oppositely disposed notches, a fusible element having a terminal blade with notches in its edges for engaging said lip by way of the notches therein.y a holding plate for the terminal blade which substantially closes the open end of the casing, having an. aperture with extended walls engaging the terminal blade with spring pressure, a `yielding packing washer snugly fitting the blade and means to exert pressure thereupon to hold the parts assembled.

et. In an enclosed electric fuse of the eartridge type, the combination of a ferruled `insulating fuse casing having an inturned lip at Vthe end of the rerrule with oppositely disposed notchesJ a fusible element having a terminal blade with notches in its edges for engaging said lip by way of the-notches therein, a holding plate for the terminal blade which substantially closes the open end of the casing7 and lips fitting with the notches in the fer-rule flange and other lips hugging the terminal blade with spring pres'- sure, a yieldingl packing washer snugly litting the blade and extended over the hold ing plate, a met-.rl washer arranged over said yielding washer, and an end cap exerting pressure on said washer and holding the parts assembled.

In testimony whereof, I have signed my name to this specification, in the presence of two subscribing witnesses.

FRANKLIN N. CONANT. Witnesses HARRY P. Moons, FRANCIS BROWN. 

